MemoryFree/MemoryFree.c


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/*
 * MemoryFree.c
 * returns the number of free RAM bytes
 */

#include "Arduino.h"  
#include "MemoryFree.h"

extern unsigned int __data_start;
extern unsigned int __data_end;
extern unsigned int __bss_start;
extern unsigned int __bss_end;
extern unsigned int __heap_start;
extern void *__brkval;


int freeMemory() {
  int free_memory;

  if((int)__brkval == 0)
     free_memory = ((int)&free_memory) - ((int)&__bss_end);
  else
    free_memory = ((int)&free_memory) - ((int)__brkval);

  return free_memory;
}